Started a fresh install and after Step 7 received the following errors:

curl/lib/.libs/libcurl.a(libcurl_la-url.o): In function `fix_hostname.isra.6':
url.c:(.text+0x3e8): undefined reference to `idn2_check_version'
url.c:(.text+0x405): undefined reference to `idn2_lookup_ul'
url.c:(.text+0x450): undefined reference to `idn2_strerror'
curl/lib/.libs/libcurl.a(libcurl_la-url.o): In function `Curl_disconnect':
url.c:(.text+0xd9c): undefined reference to `idn2_free'
url.c:(.text+0xdb8): undefined reference to `idn2_free'
url.c:(.text+0xdd4): undefined reference to `idn2_free'
url.c:(.text+0xdf0): undefined reference to `idn2_free'
curl/lib/.libs/libcurl.a(libcurl_la-url.o): In function `Curl_connect':
url.c:(.text+0x3da7): undefined reference to `idn2_free'
curl/lib/.libs/libcurl.a(libcurl_la-url.o):url.c:(.text+0x3dc3): more undefined references to `idn2_free' follow
curl/lib/.libs/libcurl.a(libcurl_la-version.o): In function `curl_version.part.0':
version.c:(.text+0x6f): undefined reference to `idn2_check_version'
version.c:(.text+0x7b): undefined reference to `idn2_check_version'
curl/lib/.libs/libcurl.a(libcurl_la-version.o): In function `curl_version_info.part.1':
version.c:(.text+0xfa): undefined reference to `idn2_check_version'
collect2: error: ld returned 1 exit status
makefile.unix:189: recipe for target 'devcoind' failed
make: *** [devcoind] Error 1

Although it did not seem likely to be successful the attempt at the GUI compile was attempted and the following error was returned...

collect2: error: ld returned 1 exit status
Makefile:525: recipe for target 'devcoin-qt' failed
make: *** [devcoin-qt] Error 1

During compilations a lot more errors were noticed in the course of the compiling than were remembered from previous compiles.

When is the last time that you have done a compile from scratch, @cpol? The code itself is beginning to come into question for me.